Image reading apparatus

ABSTRACT

A scanner includes a reading unit that reads an image of a paper, a medium feeding portion that is capable of selecting a first feeding mode in which a separation feeding for separately feeding a paper bundle in which a plurality of sheets of paper is overlapped with each other is performed and a second feeding mode in which a non-separation feeding for collectively feeding the paper bundle without separating is performed, and a pair of first transporting rollers and a pair of second transporting rollers that transport the paper fed by the medium feeding portion, in a case in which the medium feeding portion feeds the paper in the second feeding mode, a first driven roller and a second driven roller respectively constituting the pair of first transporting rollers and the pair of second transporting rollers are driven in a rotation direction where the paper is transported.

BACKGROUND 1. Technical Field

The present invention relates to an image reading apparatus reading anoriginal document.

2. Related Art

In a scanner which is an example of an image reading apparatus, anautomatic document feeder (also refer to as ADF) which automaticallyfeeds an original document as a medium is provided, and the scanner maybe configured to automatically feed and read a plurality of the originaldocuments.

In the image reading apparatus having such a configuration, there is aneed for a user to read a booklet-like body such as a passport or apassbook.

In a case in which an opened page of the booklet body is read by theautomatic document feeder which automatically feeds the plurality of theoriginal documents, the automatic document feeder is designed toseparate overlapped pages and to send the pages one by one, thus isincapable of feeding the opened booklet body, and furthermore, there isa concern that paper jam (clogging) may be generated and the pages ofthe booklet body may be impaired.

In addition, there is a case in which the opened booklet body is thick,the booklet body is not capable of passing between two rollers of a pairof transporting rollers which transports a medium, and thus a non-feedstate is caused.

Here, as a scanner capable of feeding the booklet body with theautomatic document feeder, there is a scanner which is configured toplace the booklet body in a state in which a page to be read is openedin a transparent holder and to feed the booklet body with the automaticdocument feeder (for example, JP-A-2016-174247).

However, in the scanner disclosed in JP-A-2016-174247 which transportsand reads the booklet body placed in the holder, an effort is requiredfor placing the booklet body in the holder.

In addition, a thickness of the booklet body placed in the holder isthicker than that of the booklet body alone, and thus a problem ofgeneration of the non-feed in the pair of transporting rollers is notsolved.

SUMMARY

An advantage of some aspects of the invention is to provide an imagereading apparatus which is capable of easily and appropriately reading abooklet body.

According to an aspect of the invention, there is provided an imagereading apparatus including a reading unit that reads an image of amedium, a medium feeding portion that is capable of selecting a firstfeeding mode in which a separation feeding for separately feeding amedia bundle in which a plurality of media is overlapped with each otheris performed, and a second feeding mode in which a non-separationfeeding for collecting and feeding the media bundle without separatingis performed, in a case in which the medium placed on a medium placingportion is fed toward the reading unit, a driving roller that isprovided on a downstream side of the medium feeding portion in a mediumfeeding direction, and a driven roller that is driven and rotated inaccordance with rotation of the driving roller, in which, in a case inwhich the medium feeding portion feeds the medium in the second feedingmode, the driven roller is driven in a rotation direction where themedium is transported.

In this configuration, in a case in which the medium feeding portionfeeds the medium in the second feeding mode, since the driven roller isdriven in a rotation direction where the medium is transported, thesecond feeding mode is performed, it is possible to simply set and feeda medium bundle (for example, booklet body such as a passport or apassbook or a bundle of paperwork) having a concern of occurrence of afeeding failure or a paper jam when the medium bundle is separated oneby one and fed by performing the second feeding mode, and also a concernof a so-called non-feed state in which the medium bundle which isthicker than one medium is not capable of entering between the drivingroller and the driven roller is reduced, and an appropriatetransportation of the medium bundle can be realized.

According to another aspect of the invention, there is provided an imagereading apparatus including a reading unit that reads an image of amedium, a medium feeding portion that is capable of selecting a firstfeeding mode in which a separation feeding for separating and feeding amedia bundle in which a plurality of media is overlapped with each otheris performed, and a second feeding mode in which a non-separationfeeding for collecting and feeding the media bundle without separatingis performed, in a case in which the medium placed on a medium placingportion is fed toward the reading unit, a driving roller that isprovided on a downstream side of the medium feeding portion in a mediumfeeding direction, and a driven roller that is driven and rotated inaccordance with rotation of the driving roller, in which, in a case inwhich the medium feeding portion feeds the medium in the second feedingmode, a contact load being applied by the driven roller to drivingroller is set to be smaller than a contact load of a case in which thefirst feeding mode is performed.

In this configuration, in a case in which the medium feeding portionfeeds the medium in the second feeding mode, since the contact loadbeing applied by the driven roller to the driving roller is smaller thanthe contact load of a case in which the medium feeding portion feeds themedium in the first feeding mode, the second feeding mode is performed,a medium bundle having a concern of generation of a feeding failure or apaper jam when the medium is fed while being separated one by one can besimply set and fed, and also a concern that a so-called non-feed statein which the medium bundle which is thicker than one sheet of a mediumis not entered between the driving roller and the driven roller can bereduced, and an appropriate transportation of the medium bundle can berealize.

Also, the contact load of a case of performing the second feeding modesimply needs to be smaller than the contact load in the case ofperforming the first feeding mode, and the contact load may also bezero.

In the image reading apparatus, a load applying unit that includes aspring supporting portion which is displaceable along a direction wherethe driven roller applies the contact load to the driving roller, and apressing spring which is provided between the spring supporting portionand the driven roller and presses the driven roller may be furtherincluded, in which the contact load may be adjusted by displacing thespring supporting portion.

In this configuration, it is possible to easily adjust the contact loadbeing applied to the driving roller by driven roller.

In the image reading apparatus, the driven roller is configured to beseparable from the driving roller, and in a case in which the mediumfeeding portion feeds the medium in the second feeding mode, the drivenroller is separated from the driving roller.

In this configuration, in a case in which the medium feeding portionfeeds the medium in the second feeding mode, since the driven roller isseparated from the driving roller, the contact load in the secondfeeding mode is set to zero, and thus it is possible to further reduce aconcern of generation of a non-feed.

In the image reading apparatus, the medium feeding portion includes afeeding roller that feeds the medium, and a separating roller that isconfigured to be displaceable between a contact state of coming intocontact with the feeding roller and a separation state of beingseparated from the feeding roller, in which, in a case in which themedium feeding portion feeds the medium in the first feeding mode, theseparating roller is set in the contact state and is rotary-driven in areverse rotation direction reverse to a normal rotation direction whichis a rotation direction of a case in which the medium is fed in areading direction by the reading unit, and in a case in which the mediumfeeding portion feeds the medium in the second feeding mode, theseparating roller is set in the separation state.

In this configuration, it is possible to easily realize switching of themedium feeding portion between the first feeding mode and the secondfeeding mode.

In the image reading apparatus, a medium detecting portion that isprovided between the medium feeding portion and the driving roller atthe closest position to the medium feeding portion, and detects themedium may be included, in a case in which the medium detecting portiondetects passing of a distal end of a medium which is fed by the mediumfeeding portion in the second feeding mode, the separating roller may beset in the contact state and may be rotary-driven in the normal rotationdirection.

In this configuration, in a case in which the medium bundle to be fed insome degree by the feeding roller, the separating roller can be set inthe contact state and be rotary-driven in the normal rotation direction.Accordingly, a transporting force can be applied to the medium bundle bythe separating roller rotary-driven in the normal rotation direction andthe feeding roller.

In the image reading apparatus, the medium feeding portion may include afeeding roller that feeds the medium, a separating roller that isrotary-driven in a reverse rotation direction reverse to the normalrotation direction which is a rotation direction of a case in which atleast a medium is fed in a reading direction by the reading unit, and apower transmitting mechanism that includes a train wheel constituted bya plurality of toothed wheels meshing with each other, and transmitspower from a driving source to the separating roller, in which, in acase in which the medium feeding portion feeds the medium in the secondfeeding mode, meshing of a part of the plurality of toothed wheelsconstituting the train wheel may be released.

In this configuration, it is possible to easily realize switching of themedium feeding portion between the first feeding mode and the secondfeeding mode.

In the image reading apparatus, the reading unit includes a firstreading unit that reads a first surface of the medium fed by the mediumfeeding portion and a second reading unit that reads a second surfacewhich is an opposite surface of the first surface, and is configured tobe displaceable a gap between the first reading unit and the secondreading unit, and the gap in a case in which the medium feeding portionperforms the second feeding mode is set to be wider than a gap in a casein which the medium feeding portion performs the first feeding mode.

In this configuration, since the gap between the first reading unit andthe second reading unit is configured to be changeable, and the gap in acase in which the medium feeding portion performs the second feedingmode set to be wider than the gap in a case in which the medium feedingportion performs the first feeding mode, it is possible to reduce aconcern that the medium bundle thicker than a medium to be transportedone by one is caught between the first reading unit and the secondreading unit so as to generate a paper jam.

In the image reading apparatus, the driven roller may include a pageturning mechanism.

In this configuration, in a case in which a plurality of sheets of amedia bundle is a booklet body, it is possible to automatically turn andread pages thereof.

In the image reading apparatus, the page turning mechanism may turn overa medium on the uppermost of the media bundle by the driven roller whichis rotary-driven in a reverse rotation direction where the medium istransported in a direction reverse to a reading direction by the readingunit.

In this configuration, it is possible to simply form a configuration ofthe page turning mechanism.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be described with reference to the accompanyingdrawings, wherein like numbers reference like elements.

FIG. 1 is an exterior perspective view illustrating a scanner accordingto a first embodiment.

FIG. 2 is a side sectional view illustrating a paper transporting pathin the scanner according to the first embodiment.

FIG. 3 is a schematic side sectional view illustrating the scanneraccording to the first embodiment.

FIG. 4 is a schematic side sectional view illustrating of a scanneraccording to a second embodiment.

FIG. 5 is a view describing a page turning operation performed by a pageturning mechanism.

FIG. 6 is a view describing the page turning operation performed by thepage turning mechanism.

FIG. 7 is an exterior perspective view illustrating a scanner in whichan operation unit which performs a switching operation of a “firstfeeding mode” and a “second feeding mode” of a medium feeding portion isprovided.

FIG. 8 is a perspective view illustrating a state of a powertransmitting mechanism in the “first feeding mode” of the medium feedingportion.

FIG. 9 is a perspective view illustrating a state of the powertransmitting mechanism in the “second feeding mode” of the mediumfeeding portion.

FIG. 10 is a main part enlarged view of the power transmittingmechanism, and is a view describing displacement of a toothed wheel in acase of switching the “first feeding mode” and the “second feeding mode”of the medium feeding portion.

DESCRIPTION OF EXEMPLARY EMBODIMENTS First Embodiment

First, an outline of an image reading apparatus according to anembodiment of the invention will be described.

As an example of the image reading apparatus in the embodiment, adocument scanner (hereinafter, simply refer to as scanner 1) which iscapable of reading at least one surface of a front surface and a rearsurface of paper as a “medium” is exemplified.

FIG. 1 is an exterior perspective view illustrating a scanner accordingto a first embodiment. FIG. 2 is a side sectional view illustrating apaper transporting path in the scanner according to the firstembodiment. FIG. 3 is a schematic side sectional view illustrating thescanner according to the first embodiment.

Regarding an X-Y-Z coordinate system illustrated in each drawing, an Xdirection indicates a paper width direction which is an apparatus widthdirection, and a Y direction indicates a paper transporting direction. AZ direction indicates a direction intersecting the Y direction andsubstantially orthogonal to a surface of the paper being basicallytransported. In addition, a +Y direction side is set to an apparatusfront surface side, and a −Y direction side is set to an apparatus rearsurface side. In addition, a left side seen from the apparatus frontsurface side is set to a +X direction, and a right side is set to a −Xdirection. In addition, a +Z direction is set to an upper side(including upper portion, upper surface, and the like) of the apparatus,and a −Z direction side is set to a lower side (including lower portion,lower surface, and the like) of the apparatus. In addition, a direction(+Y direction side) where paper P is fed is set to a “downstream”, andan opposite direction thereof (−Y direction side) is set to an“upstream”. Outline of Scanner

Hereinafter, a scanner 1 according to the invention will be describedmainly with reference to FIGS. 1 and 2.

The scanner 1 illustrated in FIG. 1 includes an apparatus main body 2 inwhich a reading unit 20 (FIG. 2) reading an image of paper P (medium) isincluded.

The apparatus main body 2 is configured with a lower portion 3 and anupper portion 4. The upper portion 4 is attached to be capable of beingopened and closed based on a downstream side of the lower portion 3 in apaper transporting direction as a rotation fulcrum, the upper portion 4is opened by being rotated on the front surface side of the apparatus,and a paper jam process of the paper P is easily performed by exposing apaper transporting path of the paper P.

A medium placing portion 11 on which the paper P is placed is providedon the apparatus rear surface side (−Y axis direction side) of theapparatus main body 2. In the medium placing portion 11, a booklet bodyG (FIG. 3) in which the plurality of sheets of paper is provided in abooklet-like form can be placed as an original document, in addition tobeing capable of placing a paper bundle in which the plurality of sheetsof paper P is overlapped with each other. In FIG. 3, the spread bookletbody G is set so that a stapled rear part thereof is placed along awidth direction (X axis direction).

Also, the medium placing portion 11 is provided to be detachable withrespect to the apparatus main body 2. A reference number 11 a indicatesa placing surface 11 a of the paper P.

In addition, the medium placing portion 11 is provided with a pair ofright and left edge guides 12 and 12 including a guide surface 13 forguiding a side edge in a width direction (X axis direction) intersectinga feeding direction (Y axis direction) of the paper P.

The edge guides 12 and 12 is provided to be slidably movable in the Xaxis direction in accordance with a size of the paper P. In theembodiment, the edge guides 12 and 12 are configured to follow an Xmovement of one edge guide 12 (for example, +X side) by a knownrack-pinion mechanism, and to move in a direction opposite to the otheredge guide 12 (−X side).

That is, in the medium placing portion 11, it is configured that thepaper P is provided at the center in the width direction, a feedingroller 14 to be described later is provided at a center region in thewidth direction, and thus paper is fed in a so-called center paperfeeding method.

The medium placing portion 11 includes a first auxiliary paper support 8and a second auxiliary paper support 9. The first auxiliary papersupport 8 and the second auxiliary paper support 9 can be accommodatedin the medium placing portion 11 as illustrated in FIG. 2, and can betaken out from the medium placing portion 11 as illustrated in FIG. 1,such that a length of the placing surface 11 a can be adjusted.

As illustrated in FIG. 1, an apparatus front surface side of the upperportion 4, an operation panel 7 for displaying operation of settingvarious reading or performing reading, contents of reading setting, andthe like.

A feeding port 6 continue to an inside of the apparatus main body 2 isprovided on an upper portion of the upper portion 4, and the paper Pplaced on the medium placing portion 11 is fed toward the reading unit20 (FIG. 2) provided inside the apparatus main body 2 from the feedingport 6.

In addition, a paper discharging tray 5 to be described later isprovided on an apparatus front surface side of the lower portion 3.

Regarding Paper Transporting Path in Scanner

Next, with reference to FIGS. 2 and 3, a paper transporting path in thescanner 1 will be described. Also, a dotted line in FIG. 2 indicates thepaper transporting path.

In the scanner 1 illustrated in FIG. 2, the paper P as an originaldocument is fed toward the reading unit 20 from the medium placingportion 11 by the medium feeding portion 10.

In the embodiment, the medium feeding portion 10 includes the feedingroller 14 feeding the paper P, and a separating roller 15 which nips thepaper P between the separating roller and the feeding roller 14 andseparates the paper P by rotating in a direction (in a counterclockwisedirection when FIG. 3 is planarly viewed) opposite to a feedingdirection of the paper P. The medium feeding portion 10 is configured tofeed the paper in a center paper feeding method, and the feeding roller14 and the separating roller 15 are provided on a center region in amedium width direction (X axis direction) intersecting a mediumtransporting direction (+Y direction).

In a case in which the paper P placed on the medium placing portion 11is fed to the reading unit 20, the medium feeding portion 10 is capableof selecting the “first feeding mode” in which separation feeding forseparating and feeding the paper bundle in which the plurality of sheetsof paper P is overlapped with each other is performed, the “secondfeeding mode” in which non-separation feeding for collecting and feedingthe paper bundle without separating is performed.

Therefore, the scanner 1 sets the paper bundle, which has a concern forcausing a feeding failure or a paper jam to be generated when the paperis fed while separating one by one, for example, the booklet body G(FIG. 3) or a bundle of paperwork such as a passport or a passbook as itis in the medium placing portion 11 without placing the paper bundleinto a sheet holder or a case, and is capable of reading the paperbundle using the reading unit 20, other than a case in which the paperwhich is separated one by one (separation feeding) and is fed is read.

Also, an operation of the medium feeding portion 10 is controlled by acontroller 19 provided inside the apparatus main body 2. In a case inwhich the medium feeding portion 10 feeds the paper in the “firstfeeding mode” or the “second feeding mode”, a specific operation of themedium feeding portion 10 will be described later.

In addition, a pair of first transporting rollers 16 and a pair ofsecond transporting rollers 17 transporting the paper P fed by thefeeding roller 14 (medium feeding portion 10) are provided on adownstream side of the feeding roller 14.

The reading unit 20 is provided between the pair of first transportingrollers 16 and the pair of second transporting rollers 17.

In FIG. 2, the paper P placed on the medium placing portion 11 is pickedup by the feeding roller 14 which is rotatably provided with respect tothe lower portion 3 and is fed to a downstream side (+Y direction side).Specifically, when the feeding roller 14 comes into contact with asurface of the paper P facing the medium placing portion 11 and isrotated, the paper P is fed toward the downstream side. Therefore, in acase in which the plurality of sheets of paper P is set in the mediumplacing portion 11 in the scanner 1, the plurality of paper issequentially fed toward from the paper P on a placing surface 11 a sidetoward the downstream side.

The pair of first transporting rollers 16 is provided on an upstreamside of the reading unit 20, and transports the paper P fed by thefeeding roller 14 toward the reading unit 20. The pair of firsttransporting rollers 16 is configured with a first driving roller 16 a(driving roller) and a first driven roller 16 b (driven roller).

The pair of first transporting rollers 16 is also provided on a centerregion in the medium width direction in the same manner as the feedingroller 14.

The reading unit 20 includes a first reading unit 20 a provided on theupper portion 4 side and a second reading unit 20 b provided on thelower portion 3 side. In the embodiment, the first reading unit 20 a andthe second reading unit 20 b are constituted by a contact type imagesensor module (CISM) as an example.

The first reading unit 20 a reads a front surface (surface toward upperside) as a “first surface” of the paper P, and the second reading unit20 b reads a rear surface (surface toward lower side) as a “secondsurface” which is an opposite surface of the “first surface”.

After at least one surface of the paper P the front surface and rearsurface is read by the reading unit 20, the paper P is nipped betweenthe pair of second transporting rollers 17 positioned on the downstreamside of the reading unit 20 and is discharged from the discharging port18 provided on the apparatus front surface side of the lower portion 3.The pair of second transporting rollers 17 is configured with a seconddriving roller 17 a (driving roller) and a second driven roller 17 b(driven roller) which is driven and rotated along rotation of the seconddriving roller 17 a.

Also, as illustrated in FIG. 3, the feeding roller 14 in the embodimentis rotary-driven by a first driving source 26 provided inside the lowerportion 3. In addition, the separating roller 15, the first drivingroller 16 a, and the second driving roller 17 a are rotary-driven by asecond driving source 27 also illustrated FIG. 3.

The first driving source 26 and the second driving source 27 arecontrolled by the controller 19, and accordingly, driving of the feedingroller 14, the separating roller 15, the first driving roller 16 a, andthe second driving roller 17 a are controlled. That is, the controller19 controls a feeding operation of the paper P.

In addition, the paper discharging tray 5 which can be pulled out fromthe discharging port 18 toward the apparatus front surface side isprovided in the lower portion 3. The paper discharging tray 5 takes astate of being accommodated on a bottom portion of the lower portion 3(FIG. 1) and a state of being pulled to the apparatus front surface sidewhich is not illustrated. In a state in which the paper discharging tray5 is pulled out, the paper P discharged from the discharging port 18 canbe loaded on the paper discharging tray 5.

Also, as illustrated in FIG. 2, a first detecting portion 22 detectingpresence and absence of the paper P placed on the medium placing portion11 is provided inside a placing region of the paper of the mediumplacing portion 11 on a downstream side of a medium movement detectingportion 21 and on an upstream side of the feeding roller 14 in themedium feeding direction. In addition, a second detecting portion 23, athird detecting portion 24, and a fourth detecting portion 25 aresequentially provided on a downstream side of the feeding roller 14, adownstream side of the pair of first transporting rollers 16, and adownstream side of the pair of second transporting rollers 17. Aposition of the paper P in the medium feeding direction can be detectedby the second detecting portion 23 and the third detecting portion 24.

The first detecting portion 22, the second detecting portion 23, thethird detecting portion 24, and the fourth detecting portion 25 areprovided on a center region in the width direction.

As the first detecting portion 22, the second detecting portion 23, thethird detecting portion 24, and the fourth detecting portion 25, a lightsensor including a light emitting portion (illustration is omitted)emitting light and a light receiving portion (illustration is omitted)receiving reflected light of the light emitted from the light emittingportion can be used. In addition, in addition to the light sensor, anultrasonic type sensor including a transmitter emitting ultrasonic wavesand a receiver provided to face the transmitter with paper to betransported therebetween can also be used. In addition, a lever typesensor, which detects displacement of a mechanical lever moved due to acontact of the paper to be transported in an optical type or an electriccontact type manner, can also be used.

Regarding Configuration to Switch First Feeding Mode and Second FeedingMode

Hereinafter, switching of the medium feeding portion 10 between the“first feeding mode” performing the separation feeding in which thepaper bundle in which the plurality of sheets of paper P is overlappedwith each other is separated and fed and the “second feeding mode”performing the non-separation feeding in which the paper bundle iscollected and fed without separating will be described.

In the medium feeding portion 10 according to the embodiment, theseparating roller 15 is configured to be displaceable between a contactstate of coming into contact with the feeding roller 14 and a separationstate of being separated from the feeding roller 14.

More specifically, as illustrated in FIG. 3, the separating roller 15 isheld by the holder 28, and when the holder 28 is pressed by a pressingmember 29, the separating roller 15 is pressed toward the feeding roller14.

The separating roller 15 is configured to be displaceable in a directionof advancing and retreating with respect to the feeding roller 14 ineach the holder 28, and when the first eccentric cam 30 which is rotatedby receiving a power from a not illustrated driving source controlled bythe controller 19 is rotated, the separating roller 15 can be switchedbetween the contact state (illustrated by solid line in FIG. 3) ofcoming into contact with the feeding roller 14 and the separation state(illustrated by dotted line in FIG. 3) in which the separating roller 15is separated from the feeding roller 14.

Also, in FIG. 3, the pressing member 29 and the first eccentric cam 30in the separation state are also illustrated by a dotted line.

Also, in a case in which the medium feeding portion 10 feeds paper inthe “first feeding mode” in which the separation feeding of the paper isperformed, the separating roller 15 is set in the contact state and isrotary-driven in a reverse rotation direction (counterclockwisedirection when FIG. 3 is planarly viewed) reverse to a normal rotationdirection (clockwise direction when FIG. 3 is planarly viewed) in a casein which the paper is fed in a reading direction (+Y direction) of thepaper by the reading unit 20. Thus, the lowest (lowermost) paper amongthe plurality of sheets of paper is separated and is fed by the feedingroller 14.

Also, a torque limiter which is not illustrated is provided in theseparating roller 15, and in a case in which a medium is not presentbetween the separating roller 15 and the feeding roller 14 or a case inwhich only one sheet of the medium is present therebetween, slippage isgenerated in the torque limiter described above, and the separatingroller 15 is driven and rotated (clockwise direction in FIG. 3). If amedium subsequent to a second medium enters between the separatingroller 15 and the feeding roller 14, slippage is generated between themedium, and the separating roller 15 is reversely rotated by a rotationtorque received from the second driving source 27 (counterclockwisedirection in FIG. 3). In this way, double-feeding of medium issuppressed.

Meanwhile, in a case in which the medium feeding portion 10 feeds thepaper in the “second feeding mode” in which the non-separation feedingof the paper is performed, the separating roller 15 is set in theseparation state. When the separating roller 15 is separated from thefeeding roller 14, it is possible to decrease a paper separation abilityof the separating roller 15 or to become the separating roller withoutthe separation ability.

Accordingly, the paper bundle (booklet body G in FIG. 3) placed on themedium placing portion 11 can be fed in a state of not being separated,that is, in a non-separating state.

Also, in a case in which the separating roller 15 in the separationstate is separated to a position where the separating roller dose notcontact with the uppermost surface of the paper bundle (booklet body G)placed on the medium placing portion 11, separation by the separatingroller 15 is not performed. The separating roller 15 in the separationstate may come into contact with the uppermost surface of the paperbundle (booklet body G) placed on the medium placing portion 11, but inthis case, the separating roller 15 can be freely rotated by stoppingthe rotation thereof or may be rotated when the rotation direction ofthe separating roller 15 is set to a normal rotation direction(clockwise direction when FIG. 3 is planarly viewed).

As seen from the above, when the contact state and the separation stateof the separating roller 15 is switched, switching of the “first feedingmode” and the “second feeding mode” in the medium feeding portion 10 canbe easily realized.

Regarding a Pair of First and Second Transporting Rollers

Here, as described in the problem to be solved in the invention, thebooklet body G illustrated in FIG. 3 is thick, and thus there may be acase in which the booklet body G fed by the medium feeding portion 10becomes a non-feeding state because the booklet cannot be enteredbetween the pair of first transporting rollers 16 or the pair of secondtransporting rollers 17 on the downstream side.

In order to suppress the non-feed of the booklet body G in the pair offirst transporting rollers 16 or the pair of second transporting rollers17, in the scanner 1, in a case in which the medium feeding portion 10feeds the booklet in the “second feeding mode”, the first driven roller16 b of the pair of first transporting rollers 16 and the second drivenroller 17 b of the pair of second transporting rollers 17 are driven ina direction where each pair of transporting rollers transports thepaper.

That is, in a case in which the medium feeding portion 10 feeds thebooklet in the “second feeding mode”, the first driven roller 16 b andthe second driven roller 17 b are rotated in a clockwise direction whenFIG. 3 is planarly viewed.

In the embodiment, the first driven roller 16 b and the second drivenroller 17 b are configured to receive power from the second drivingsource 27 and driving thereof is controlled by the controller 19. Ofcourse, the rollers can be configured to receive the power from thefirst driving source 26 and also configured to include the other drivingsource.

Also, a switching unit, which is not illustrated, for switching atransmission state in which power is transmitted from the first drivingsource 26 to the first driven roller 16 b and the second driven roller17 b and a cut-off state of the transmission of the power is provided,and the switching unit is controlled by the controller 19 so as to becapable of switching a state in which the first driven roller 16 b andthe second driven roller 17 b are driven and rotated and a state inwhich the first driven roller 16 b and the second driven roller 17 b aredriven and rotated in accordance with the rotation of the first drivingroller 16 a and the second driving roller 17 a.

As described above, in a case in which the medium feeding portion 10feeds the paper in the “second feeding mode”, the first driven roller 16b and the second driven roller 17 b are also rotary-driven in adirection where the paper is transported, the thick booklet body G iseasily entered between the rollers of the pair of first transportingrollers 16 and the pair of second transporting rollers 17, andaccordingly, it is possible to suppress generation of non-feed in thepair of first transporting rollers 16 or the pair of second transportingrollers 17 and to realize appropriate transportation of the booklet bodyG.

Other Configuration in Second Feeding Mode

In a case in which the “second feeding mode” is performed, aconfiguration as follows can be used.

That is, in a case in which the second detecting portion 23 (FIG. 2 andFIG. 3) provided as a “medium detecting portion” detecting the paperdetects passing of a distal end of an original document (booklet body G)to be fed by the medium feeding portion 10 in the “second feeding mode”between the medium feeding portion 10 and the first driving roller 16 awhich is a “driving roller” at the closest position to the mediumfeeding portion 10, the separating roller 15 is set in the contact state(state of separating roller 15 illustrated by solid line in FIG. 3) andis rotary-driven in the normal rotation direction (clockwise directionin FIG. 3).

After the booklet body G being fed by the feeding roller 14 is fed insome degree, when the separating roller 15 is set in the contact stateand is rotary-driven in the normal rotation direction, the mediumfeeding portion 10 can be configured to apply a transporting force tothe booklet body G. Accordingly, the booklet body G can be efficientlytransported.

Also, a timing when the separating roller 15 is set in the contact stateand is rotary-driven in the normal rotation direction is not limited toa timing when the second detecting portion 23 detects the booklet bodyG. For example, after a predetermined time elapses since the seconddetecting portion 23 detects the booklet body G, or after apredetermined amount of the booklet body is transported, the separatingroller 15 may be switched from the separation state to the contact stateand be rotary-driven in the normal rotation direction.

Regarding Reading Unit

Subsequently, a configuration of the reading unit 20 will be described.

The reading unit 20 illustrated in FIG. 3 includes the first readingunit 20 a positioned on an upper side with the paper transporting pathand the second reading unit 20 b positioned on a lower side. That is, agap between the reading surface of the first reading unit 20 a and thereading surface of the second reading unit 20 b becomes a pass height ofthe paper transporting path.

Usually, the gap between the reading surface of the first reading unit20 a and the reading surface of the second reading unit 20 b is set as agap through which a thin paper passes, and thus the first reading unit20 a and the second reading unit 20 b are pressed in a direction closeto each other. Thus, the reading surface of each reading unit surelycomes into contact with the paper P (original document).

Also, in FIG. 3, a referent number 31 indicates a first pressing member31 such as a coil spring pressing the first reading unit 20 a to thesecond reading unit 20 b side, and a referent number 32 indicates asecond pressing member 32 such as a coli spring pressing the secondreading unit 20 b to the first reading unit 20 a side.

In addition, any one of the first reading unit 20 a and the secondreading unit 20 b is configured to be displaceable in an advance andretreat manner with respect to the other, and the gap between the firstreading unit 20 a and the second reading unit 20 b can be changed.

In the embodiment, a displacement mechanism is provided in the firstreading unit 20 a and is configured to displace the first reading unit20 a between an advanced position illustrated by a solid line in FIG. 3and a retreated position illustrated by a dotted line in FIG. 3 as well.As the displacement mechanism, a second eccentric cam 33 which isrotated by a not illustrated driving source is provided. The drivingsource is controlled by the controller 19, and rotation of the secondeccentric cam 33 is also controlled, and thereby making it possible toadjust the gap between the first reading unit 20 a and the secondreading unit 20 b.

Here, the controller 19 controls to set the gap between the firstreading unit 20 a and the second reading unit 20 b in a case in whichthe medium feeding portion 10 performs the “second feeding mode” to bewiden than the gap in a case in which the reading unit performs the“first feeding mode”.

That is, in a case in which the booklet body G is fed in the “secondfeeding mode”, the gap between the first reading unit 20 a and thesecond reading unit 20 b is spread. Thus, it is possible to reduce aconcern that the booklet body G thicker than the paper P to betransported one by one is caught between the first reading unit 20 a andthe second reading unit 20 b so as to generate a paper jam.

Second Embodiment

In the embodiment, with reference to FIG. 4, in a case in which themedium feeding portion 10 feeds paper in the “second feeding mode”, theother examples of the configuration of the pair of first transportingrollers 16 or the pair of second transporting rollers 17 in order tosuppress the non-feed of the booklet body G.

FIG. 4 is a schematic side sectional view illustrating of a scanneraccording to a second embodiment.

Also, in embodiments subsequent to this embodiment, the same referencenumber is given to the same configuration as that of the firstembodiment, and description thereof will be omitted.

The non-feed of the booklet body G in the pair of first transportingrollers 16 or the pair of second transporting rollers 17 can also besuppressed by a configuration as follows.

That is, with respect to the pair of first transporting rollers 16, in acase in which the medium feeding portion 10 feeds paper in the “secondfeeding mode”, a contact load applied by the first driven roller 16 b tothe first driving roller 16 a is set to be smaller than a contact loadof a case in which the medium feeding portion feeds paper in the “firstfeeding mode”. In addition, with respect to the pair of secondtransporting rollers 17, in a case in which the paper is fed in the“second feeding mode”, the contact load being applied by the seconddriven roller 17 b to the second driving roller 17 a is set to besmaller than the contact load of a case in which the paper is fed in the“first feeding mode”.

As more specific configuration, the scanner 1 includes a load applyingunit 40 which is capable of changing a contact load being applied by thefirst driven roller 16 b to the first driving roller 16 a in the pair offirst transporting rollers 16 and a contact load being applied by thesecond driven roller 17 b to the second driving roller 17 a in the pairof second transporting rollers 17.

The load applying unit 40 includes a spring supporting portion 41displaceable along a direction (arrow A direction illustrated in FIG. 4)where the first driven roller 16 b and the second driven roller 17 brespectively apply a contact load to driving rollers (first drivingroller 16 a and second driving roller 17 a), and a pressing spring 42and a pressing spring 43 which are provided between the springsupporting portion 41 and the first driven roller 16 b and between thespring supporting portion 41 and the second driven roller 17 b and pressthe first driven roller 16 b and the second driven roller 17 b.

The contact load of each of the first driven roller 16 b and the seconddriven roller 17 b can be adjusted by displacing the spring supportingportion 41.

When the spring supporting portion 41 is displaced in the arrow Adirection, that is, the spring supporting portion 41 is close to thefirst driven roller 16 b and the second driven roller 17 b, the contactload increases, and when the spring supporting portion 41 is displacedin a direction opposite to the arrow A direction, that is, the springsupporting portion 41 is pulled away from the first driven roller 16 band the second driven roller 17 b, the contact load decreases.

In the embodiment, the spring supporting portion 41 is configured to bedisplaced by rotating a third eccentric cam 44 receiving the power of adriving source which is not illustrated. The driving source iscontrolled by the controller 19, and thus rotation of the thirdeccentric cam 44 is controlled, and thereby making it possible to adjustthe contact load.

Also, in the embodiment, both the pressing spring 42 for the firstdriven roller 16 b and the pressing spring 43 for the second drivenroller 17 b are supported by the spring supporting portion 41 common toboth of them, but each of the pressing spring 42 for the first drivenroller 16 b and the pressing spring 43 for the second driven roller 17 bcan be configured to be supported by an individual spring supportingportion.

Using the load applying unit 40 having such a configuration describedabove, the contact loads being applied by the first driven roller 16 band the second driven roller 17 b to the first driving roller 16 a andthe second driving roller 17 a which are driving rollers respectivelycorresponding to the first driven roller 16 b and the second drivenroller 17 b can be easily adjusting.

Also, in a case in which the medium feeding portion 10 feeds the paperin the “second feeding mode”, the contact lade being applied by thefirst driven roller 16 b and the second driven roller 17 b to the firstdriving roller 16 a and the second driving roller 17 a respectivelycorresponding to the contact lade being applied by the first drivenroller 16 b and the second driven roller 17 b is set to be smaller thanthe contact load of a case in which the paper is fed in the “firstfeeding mode”, and thus the booklet body G is easily entered between therollers of the pair of first transporting rollers 16 and the pair ofsecond transporting rollers 17. Accordingly, a concern of generation ofthe non-feed of the booklet body G in the pair of first transportingrollers 16 and the pair of second transporting rollers 17 is reduced,and thereby making it possible to realize appropriate transportation ofthe booklet body G.

In addition, in the embodiment, the first driven roller 16 b and thesecond driven roller 17 b are moved in a direction separated from thefirst driving roller 16 a and the second driving roller 17 a by adisplacement unit which is not illustrated and are configured to beseparated from the first driving roller 16 a and the second drivingroller 17 a. Also, in a case in which the medium feeding portion 10feeds the paper in the “second feeding mode”, the first driven roller 16b and the second driven roller 17 b can be separated from the firstdriving roller 16 a and the second driving roller 17 a.

That is, in a case in which the medium feeding portion 10 feeds paper inthe “second feeding mode”, the contact load is set to zero. Thus,generation of the non-feed of the booklet body G in the pair of firsttransporting rollers 16 and the pair of second transporting rollers 17can be further suppressed.

Also, the displacement unit is controlled by the controller 19, andseparation of the first driven roller 16 b and the second driven roller17 b from the first driving roller 16 a and the second driving roller 17a is suppressed.

Third Embodiment

A page turning mechanism 50 which automatically turns pages of thebooklet body G to be read can be provided in the scanner 1. In theembodiment, with reference to FIGS. 5 and 6, the page turning mechanism50 will be described.

FIGS. 5 and 6 are views describing a page turning operation by the pageturning mechanism.

In the embodiment, the page turning mechanism 50 illustrated in FIGS. 5and 6 is provided in the first driven roller 16 b constituting the pairof first transporting rollers 16. In other words, the scanner 1 includesthe first driven roller 16 b including the page turning mechanism 50.

More specifically, the page turning mechanism 50 includes a holdingportion 51 and a distal end portion 52 which is attached to a distal endof the holding portion 51 so as to be movable, and these components areprovided in the first driven roller 16 b.

The pair of first transporting rollers 16 and the pair of secondtransporting rollers 17 are configured to be rotatable in bothdirections of a normal rotation direction (for example, rotationdirection illustrated by arrow in top view of FIG. 5) where paper istransported in a reading direction (+Y direction) of the paper by thereading unit 20 and a reverse rotation direction (for example, rotationdirection illustrated by arrow in second view from top of FIG. 5) wherethe paper is transported in a reverse direction (−Y direction) reverseto the reading direction. In addition, the first driven roller 16 b ofthe pair of first transporting rollers 16 is configured to receive powerfrom a driving source which is not illustrated and to be drivable androtatable at least in the reverse rotation direction.

Also, the page turning mechanism 50 is configured to turn a medium onthe uppermost of booklet body G by the first driven roller 16 b rotatedand drive in the reverse rotation direction.

Hereinafter, with reference to FIGS. 5 and 6, a page turning operationby the page turning mechanism 50 will be described.

The top view of FIG. 5 illustrates a state in which a first page P1 oftwo facing pages of the booklet body G is finished to be read. At thetime of reading the pages by the reading unit 20, the pair of firsttransporting rollers 16 and the pair of second transporting rollers 17are rotated in the normal rotation direction.

After the first page of the two facing pages 1 is finished to be read,as illustrated in a second view from the top of FIG. 5, the pair offirst transporting rollers 16 and the pair of second transportingrollers 17 are rotated in the reverse rotation direction, and a distalend of the booklet body G in the reading direction is nipped by the pairof first transporting rollers 16.

If the distal end of the booklet body G in the reading direction isnipped by the pair of first transporting rollers 16, the first drivingroller 16 a is stopped, and only the first driven roller 16 b isrotary-driven in the reverse rotation direction.

Then, as illustrated in the second view from a bottom of FIG. 5, thefirst driven roller 16 b picks up a page on the uppermost.

Continuously, when the first driven roller 16 b is rotary-driven in thereverse rotation direction, as illustrated in a bottommost view of FIG.5, a distal end of the picked-up page is caught and held by the holdingportion 51 and the distal end portion 52.

If the first driven roller 16 b is rotary-driven by a predeterminedamount in the reverse rotation direction, driving of the first drivenroller 16 b is stopped, as illustrated in a top view of FIG. 6, thedistal end portion 52 is displaced so as to be folded upwardly. In thisway, the distal end of the page held by the holding portion 51 and thedistal end portion 52 is deviated and turned, and a second page P2 ofthe two facing pages is opened.

Also, the distal end portion 52 is operated by receiving power from adriving source which is not illustrated.

After the page of the booklet body G is turned over and the second pageP2 of two facing pages is opened, as illustrated from a second view fromthe top of FIG. 6 to a second view from the bottom of FIG. 6, the pairof first transporting rollers 16 and the pair of second transportingrollers 17 are rotated in the normal rotation direction so that thesecond page P2 of two facing pages is read.

After the second page P2 of two facing pages is finished to be read(second view from bottom of FIG. 6), in a case in which a next page(third page of two facing pages) is read, as illustrated in thebottommost view of FIG. 6, the pair of first transporting rollers 16 andthe pair of second transporting rollers 17 are rotated again in thereverse rotation direction, the distal end of the booklet body G in thereading direction is sent to a position where the distal end is nippedby the pair of first transporting rollers 16, the distal end portion 52is returned in a direction communicating with the holding portion 51,and operations subsequent to that of the second view from the bottom ofFIG. 5.

Also, a timing when the curved distal end portion 52 in the top view ofFIG. 6 is returned to an original state thereof is good to be a timingbefore a page turning operation (operation in second view from bottom ofFIG. 5) in which the only first driven roller 16 b is rotary-driven inthe reverse rotation direction starts, and is not limited to a timingright before the page turning operation.

As seen from the above, when the scanner 1 includes the pair of firsttransporting rollers 16 including the page turning mechanism 50, thepage of the booklet body G can be automatically turned and read.Accordingly, it is possible to easily and continuously read a pluralityof pages of the booklet body G.

Fourth Embodiment

In the embodiment, with reference to FIGS. 7 to 10, another example ofthe configuration of the medium feeding portion 10 to switch the “firstfeeding mode” and the “second feeding mode” will be described.

FIG. 7 is an exterior perspective view illustrating the scanner providedwith the operation unit performing a switching operation between the“first feeding mode” and the “second feeding mode” of the medium feedingportion. FIG. 8 is a perspective view illustrating a state of a powertransmitting mechanism in the “first feeding mode” of the medium feedingportion. FIG. 9 is a perspective view illustrating a state of the powertransmitting mechanism in the “second feeding mode” of the mediumfeeding portion. FIG. 10 is a main part enlarged view of the powertransmitting mechanism, and is a view describing displacement of atoothed wheel in a case of being switched between the “first feedingmode” and the “second feeding mode” of the medium feeding portion.

In the embodiment, switching between the “first feeding mode” in whichthe medium feeding portion 10 separately feeds the paper and the “secondfeeding mode” in which the medium feeding portion 10 non-separatelyfeeds the paper is performed by switching a connection state (FIG. 8) ofconnecting transmission of power to the separating roller 15 and arelease state (FIG. 9) of releasing the transmission of the power to theseparating roller 15.

In other words, a power transmitting mechanism 60 which transmits thepower from the second driving source 27 is provided in the separatingroller 15, the power transmitting mechanism 60 includes a second trainwheel 62 as a “train wheel” constituted by a plurality of toothed wheelsto be engaged, and in a case in which the medium feeding portion 10feeds the paper in the “second feeding mode”, engagement of a part ofthe plurality of toothed wheels constituting the second train wheel 62is released.

Hereinafter, with reference to FIG. 8, the power transmitting mechanism60 will be described.

The power transmitting mechanism 60 includes a first train wheel 61including the toothed wheel which is engaged with a not illustratedrotation shaft of the separating roller 15, a second train wheel 62provided on a −X direction side of in the apparatus main body 2 (FIG.1), and a shaft portion 63 which connects the first train wheel 61 andthe second train wheel 62 to each other.

The second train wheel 62 includes a toothed wheel 64, a toothed wheel65 meshing with the toothed wheel 64, and a toothed wheel group 66including a toothed wheel meshing with the toothed wheel 65 and thetoothed wheel meshing with the shaft portion 63.

In FIG. 8, the toothed wheel 64 is connected to a rotation shaft (notillustrated) of the pair of first transporting rollers 16 and isconfigured to receive the power from the second driving source 27through the pair of first transporting rollers 16 (being driven by powerof second driving source 27). The power that the toothed wheel 64 of thesecond train wheel 62 receives is transmitted to the separating roller15 through the shaft portion 63 and the first train wheel 61.

Here, an operation unit 67 performing the switching operation of the“first feeding mode” and the “second feeding mode” of the medium feedingportion 10 is provided in the upper portion 4 of the scanner 1, asillustrated in FIG. 7. A referent number 67 a indicates a knob portion67 a for operating.

The operation unit 67 is provided to slidably reciprocate with respectto the upper portion 4 in an X axis direction, and as illustrated inFIGS. 8 and 9, is connected to the second train wheel 62 of the toothedwheel 65, which constitutes the power transmitting mechanism 60transmitting the power from the second driving source 27 to theseparating roller 15, in a connecting portion 68.

The toothed wheel 65 connected to the operation unit 67 is configured tobe shifted and movable in a sliding direction of the operation unit 67.Therefore, the operation unit 67 is slid in the X axis direction, and iscapable of switching the connection state (FIG. 8) in which the toothedwheel 65 and the toothed wheel 64 are meshed with each other and thetoothed wheel 65 and the toothed wheel group 66 are meshed with eachother, and the release state (FIG. 9) in which the connection of thetoothed wheel 65 and the toothed wheel 64 is released and the connectionof the toothed wheel 65 and the toothed wheel group 66 is released.

In the embodiment, in a case in which the knob portion 67 a of theoperation unit 67 is slid to a +X direction side, the toothed wheel 65is disposed at a position illustrated by a solid line of FIGS. 8 and 10,and a state becomes the connection state in which the toothed wheel 65and the toothed wheel 64 are meshed with each other and the toothedwheel 65 and the toothed wheel group 66 are meshed with each other.

In the connection state, the power of the second driving source 27 istransmitted to the separating roller 15, and the paper is separated bythe separating roller 15. That is, the medium feeding portion 10 can beset in the “first feeding mode”.

Also, in FIG. 10, disclosure of the operation unit 67 and the connectingportion 68 will be omitted.

In addition, in a case in which the operation unit 67 is slid to a −Xdirection side, the toothed wheel 65 is disposed at a positionillustrated by a two-dot chain line of FIGS. 9 and 10, and the statebecomes the release state in which meshing of the toothed wheel 65 andthe toothed wheel 64 and meshing of the toothed wheel 65 and the toothedwheel group 66 are released. In the release state, since the power fromthe toothed wheel 64 is not transmitted to the toothed wheel group 66,the separating roller 15 is not rotated. That is, the paper is notseparated by the separating roller 15. Therefore, the medium feedingportion 10 can be set in the “second feeding mode”.

With the configuration described above, switching of feeding in the“first feeding mode” and feeding in the “second feeding mode” by themedium feeding portion 10 can be easily realized.

Also, as described above, in addition to that the toothed wheel 65 ismanually displaced in the X axis direction using the operation unit 67,the toothed wheel 65 can also be automatically displaced in the X axisdirection using, for example, an actuator such as a solenoid.

In addition, as a configuration to switch the “first feeding mode” andthe “second feeding mode” of the medium feeding portion 10, the scanner1 may include both a configuration of separating the separating roller15 from the feeding roller 14 as described in the first embodiment and aconfiguration of releasing meshing of the toothed wheels constitutingthe second train wheel 62 of the power transmitting mechanism 60 asdescribed in this embodiment.

After the separating roller 15 is separated from the feeding roller 14,since meshing of the toothed wheels constituting the second train wheel62 is released, and rotation in a separating direction of the separatingroller 15 can be stopped, a non-separation in which separation is notmore reliably performed by the separating roller 15 can be set.

Also, the invention is not limited to each embodiment described above,various modifications can be performed within a range of the inventiondisclosed in claims, and it is needless to say that the modificationsare also included within the range of the invention.

This application is a continuation of U.S. application Ser. No.16/144,933, filed Sep. 27, 2018, which claims priority to JapanesePatent Application No. 2017-188526, filed Sep. 28, 2017, the entiredisclosures of which are expressly incorporated by reference herein.

What is claimed is:
 1. An image reading apparatus comprising: a readingunit that reads an image of a medium; and a transport roller pair thatis configured to transport a medium bundle, the medium bundle comprisinga plurality of medium that are stacked so as to overlap each other,wherein the transport roller pair transports the medium bundle bydriving both of the rollers of the transport roller pair when thereading unit reads the medium bundle that has not had the plurality ofmedium separated from each other.
 2. An image reading apparatuscomprising: a reading unit that reads an image of a medium; a transportroller pair that is configured to transport a medium bundle, the mediumbundle comprising a plurality of media that are stacked so as to overlapeach other, wherein the transport roller pair is configured to berotatable in a normal rotation direction where the medium bundle istransported in a transporting direction toward the reading unit and areverse rotation direction where the medium bundle is transported in areverse direction that is opposite to the transporting direction,wherein the transport roller pair transports the medium bundle, afterbeing read by the reading unit, in the reverse direction that isopposite to the transporting direction by rotating in the reverserotation direction.
 3. The image reading apparatus according to claim 1,wherein a first contact load between the transport roller pair and themedium bundle that has not had the plurality of medium separated fromeach other when the transport roller pair transports the medium bundleis set to be smaller than a second contact load between the transportroller pair and a medium that has been separated from the medium bundlewhen the transport roller pair transports the separated medium.
 4. Theimage reading apparatus according to claim 2, wherein a first contactload between the transport roller pair and the medium bundle that hasnot had the plurality of medium separated from each other when thetransport roller pair transports the medium bundle is set to be smallerthan a second contact load between the transport roller pair and amedium that has been separated from the medium bundle when the transportroller pair transports the separated medium.
 5. The image readingapparatus according to claim 3, wherein both of the rollers of thetransport roller pair are separated from each other when the transportroller pair transports the medium bundle that has not had the pluralityof medium separated from each other.
 6. The image reading apparatusaccording to claim 4, wherein both of the rollers of the transportroller pair are separated from each other when the transport roller pairtransports the medium bundle that has not had the plurality of mediumseparated from each other.
 7. The image reading apparatus according toclaim 1, wherein the reading unit includes a first reading unit thatreads a first surface of the medium and a second reading unit that readsa second surface which is an opposite surface of the first surface, thefirst reading unit and the second reading unit are configured to bedisplaceable by a gap, and wherein the gap in a case in which thetransport roller pair transports the medium bundle that has not had theplurality of medium separated from each other is set to be wider thanthe gap in a case in which the transport roller pair transports themedium that has been separated from the medium bundle.
 8. The imagereading apparatus according to claim 2, wherein the reading unitincludes a first reading unit that reads a first surface of the mediumand a second reading unit that reads a second surface which is anopposite surface of the first surface, the first reading unit and thesecond reading unit are configured to be displaceable by a gap, andwherein the gap in a case in which the transport roller pair transportsthe medium bundle that has not had the plurality of medium separatedfrom each other is set to be wider than the gap in a case in which thetransport roller pair transports the medium that has been separated fromthe medium bundle.
 9. The image reading apparatus according to claim 1,wherein the transport roller pair is configured to be rotatable in anormal rotation direction where the medium bundle is transported in atransporting direction and a reverse rotation direction where the mediumbundle is transported in a reverse direction that is opposite to thetransporting direction, wherein the transport roller pair transport themedium bundle after being read by the reading unit in the reversedirection to the transporting direction by rotating in the reverserotation direction.
 10. The image reading apparatus according to claim2, wherein both of the rollers of the transport roller pair are drivenin the reverse rotation direction, when the transport roller pairtransports the medium bundle in the reverse direction opposite to thetransporting direction.
 11. The image reading apparatus according toclaim 6, wherein both of the rollers of the transport roller pair aredriven in the reverse rotation direction, when the transport roller pairtransports the medium bundle in the reverse direction opposite to thetransporting direction.
 12. The image reading apparatus according toclaim 1, further comprising: a medium feeding portion that feeds themedium bundle, wherein the medium feeding portion separates theplurality of medium from the media bundle and transports the separatedmedium to the reading unit.
 13. The image reading apparatus according toclaim 2, further comprising: a medium feeding portion that feeds themedium bundle, wherein the medium feeding portion separates theplurality of medium from the media bundle and transports the separatedmedium to the reading unit.
 14. The image reading apparatus according toclaim 2, wherein the both of the rollers of the transport roller pairare driven, when transporting the medium bundle.
 15. The image readingapparatus according to claim 1, wherein the transport roller pair islocated on both sides of the reading unit in the transport direction.16. The image reading apparatus according to claim 2, wherein thetransport roller pair is located on both sides of the reading unit inthe transport direction.
 17. The image reading apparatus according toclaim 1, wherein the transport roller pair includes a driven roller anda drive roller, wherein a load applying unit is capable of changing acontact load between the rollers of the transport roller pair, whereinthe load applying unit includes a spring supporting portion which isdisplaceable along a direction where the driven roller applies thecontact load to the driving roller, and a pressing spring which isprovided between the spring supporting portion and the driven roller andpresses the driven roller, wherein the contact load is adjusted bydisplacing the spring supporting portion.
 18. The image readingapparatus according to claim 2, wherein the transport roller pairincludes a driven roller and a drive roller, wherein a load applyingunit is capable of changing a contact load between the rollers of thetransport roller pair, wherein the load applying unit includes a springsupporting portion which is displaceable along a direction where thedriven roller applies the contact load to the driving roller, and apressing spring which is provided between the spring supporting portionand the driven roller and presses the driven roller, wherein the contactload is adjusted by displacing the spring supporting portion.
 19. Theimage reading apparatus according to claim 1, further comprising: amedium feeding portion that is configured to perform a first feedingmode in which a separation feeding is performed for separately feedingthe plurality of medium that are overlapped with each other in themedium bundle, and is configured to perform a second feeding mode inwhich a non-separation feeding is performed for collecting and feedingthe medium bundle without separating the plurality of medium, anoperation unit that switches the first feeding mode and the secondfeeding mode.
 20. The image reading apparatus according to claim 8,wherein the medium feeding portion includes a feeding roller that feedsthe medium, a separating roller that is rotary-driven in a reverserotation direction reverse to the normal rotation direction which is arotation direction of a case in which at least the medium is fed in thetransporting direction toward the reading unit, and a power transmittingmechanism that includes a train wheel constituted by a plurality oftoothed wheels meshing with each other, and transmits power from adriving source to the separating roller, wherein in a case in which themedium feeding portion feeds the medium in the second feeding mode,meshing of a part of the plurality of toothed wheels constituting thetrain wheel is released.